A man with his wife and nine children is waiting for a bus. A blind man is also standing at the bus stop. When the bus arrives, it is already so full that only the wife and children can get in. The man and the blind must walk.
After a while, the father of the family can no longer bear the clatter of the blind man’s cane against the pavement. He angrily says, “Why don’t you put the rubber on the end of the stick? That clatter gets on my nerves!”

The blind man angrily replies, “If you had put the rubber on the stick at the right time, we both would have fit on the bus!”